Synthesis, characterization and optical spectroscopy of Eu3+ doped titanate nanotubes

Abstract

a b s t r a c tThe synthesis of Eu 3 þ doped titania nanotubes was carried out via a hydrothermal method. X-ray diffraction and transmission electron microscope analyses showed that the nanotubes were formed by rolling multilayered titania structure with a length of up to 100 nm. The Eu 3 þ -doped nanotubes exhibited strong emission lines associated with the 5 D 0 -7 F J (with J from 1 to 4) transition of Eu 3 þ and the differences between the luminescence properties of the precursor powders and the nanotubes were studied at low temperature.

Upconverting Ho–Yb doped titanate nanotubes

“…1b). These patterns are basically the same as those reported previously for this material [16,20,21]. Worth to be mentioning is the behavior of the diffraction peak centered at 2θ almost 10°, attributed to the interlayer diffraction of the titanate nanotubes (Fig.…”

“…Titanate Ho 3 + -Yb 3 + codoped nanotubes were synthesized by hydrothermal method from the precursor powder [16]. 0.5 g of precursor powder was mixed with 80 ml of NaOH 10 M and then transferred into a Teflon vessel and heated at 120°C for 72 h. After cooling at RT the powder was washed several times with HCl 0.1 M and deionized Contents lists available at SciVerse ScienceDirect…”

“…This material not only has shown excellent photo-catalytic and magnetic properties [10], also it has been considered to be a potential host for lanthanide ions because of their low-cost and high transparency in the visible wavelength region as well as good thermal, chemical, and mechanical properties [11,12]. The synthesis of titanate nanotubes has been successfully obtained by a great variety of methods [13][14][15][16].…”

“…J. Yin et al [18] reported the luminescence properties of Eu 3 + -doped titanate nanowires synthesized by sol-gel hydrothermal chemistry. Very recently, our research group presented a study of Eu 3 + -doped titanate nanotubes which exhibited strong red emission [16].…”

Synthesis, Characterization and Adsorption Studies of Chlorine–doped Carbon Nanotubes

“…CNTs generally possess outstanding physical, mechanical and electrical properties, according to Peng et al [10] and De Volder et al [11], they possess elastic modulus of up to 1 TPa, and a tensile strength of about 100 Gpa thus making CNTs over 10-fold stronger than any industrial fibre, also a typical MWCNT has been reported to carry a current of up to 10 9 A cm -2 and individual SWCNT can have a thermal conductivity of about 3500 W m -1 K -1 at room temperature [10]. These outstanding properties coupled with the high aspect ratio of up to 1,000,000 makes CNTs ideal for a lot of uses and applications such as: drug delivery, genetic engineering, non-metallic catalyst material, anti-oxidant material, artificial implant material field emission transistors, probe sensors, polymer composite materials, anti-rust coating composite materials, gigahertz diode, and conductive fillers in rechargeable batteries and lately as an adsorbent for the removal bio-fouling and toxic materials from the environment [10][11][12][13][14][15][16][17][18]. Over the past few years, several method have been developed for the synthesis of CNTs, but the most commonly used methods are: electric arc discharge method, laser ablation method and the chemical vapour deposition (CVD) method.…”